Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec544ca35fca095…

MALICIOUS

PDF

92.5 KB Created: 2021-09-06 22:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3486447e2514e1ea240ef4422807affa SHA-1: 17fb9947f98c056fd0f313797e6796fca26e5bf0 SHA-256: 6ec544ca35fca095396351c6b34263dc36a7a3bce926675a59f4c15be119f393
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a link farm and a lure for a password-protected archive. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and heuristics point towards a phishing or malware delivery mechanism, likely involving a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8f6dae5a86d19e25b19c7f5976694170/segoxiwedut.pdf In PDF document text
    • http://studionegrelli.it/userfiles/files/fozixupakezodoru.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/negaj.pdfIn PDF document text
    • https://equinox-e.com/upload/files/sakogigorifazisiwobu.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/43682114929.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094b86cd6a88---sopavudinopepewimezesada.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/lrjvrfe7ut7c4qco0gpofv8k0g/54788938724.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070481604152---17906388944.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b57d356c93e---limuxalubolobu.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/gizodajose.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca0bd7419b---13655274895.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/wotasexotogoz.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/2c6ffc7cdc024b29402eafcbc821fed2/zejajewanedal.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070f18b5a51a---zetolenunudodafezet.pdfIn PDF document text
    • http://veribase.com/E/file/83602458102.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/taferevivu.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4f42b3094---lobigebevenawu.pdfIn PDF document text
    • http://fygl.net/uploads/file/180700401711.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/mijuzelotevekiwa.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/urve704n8e3b23ft5a48v6diek/felugejovujususiganuwukus.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ed8706d4a---rebiwejepavibusulejatuv.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210629_466b1.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210621024942717.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/xutavogapumap.pdfIn PDF document text
    • http://xn----dtbfdwc0aaaev8k.xn--p1ai/ckfinder/userfiles/files/61614107401.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611fe345103bd---25611929760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=protect+worksheet+in+excel+filePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 10552 bytes
SHA-256: 1cbe33deb8681b90821c95d29fed08fd38c150b4569ca4ac48a9a33abd258b7c
font_01_sfnt_off00011cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC6 18024 bytes
SHA-256: bb7f882186c422ecab5866b5ebc0a2024d433794d794325f521fdceb1db7479a
font_02_sfnt_off00014bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1